I am not aware of any evidence that hair grows faster in the summer.  There is no scientific basis for it so it sounds like a myth to me.  But I'll look into a little more to see if I can get a definitive answer.

I always noticed personally, that my hair (and unfortunately body hair too) grew twice as fast when exposed to heat and sunlight. When I used to use tanning beds the effect was even more magnified, even during the winter. Although who knows if tehre weren't other factors at stake. What I will say is that I'm the only person I know personally that's encountered this, or at least noticed it. But yes, that myth has been around quite a bit. It probably stems from the idea that irritation stimulates hair follicles (sun=irritation). Tough to say whether or not it would actually be fact though.

that's interesting. here's another cool one I found: http://www.ncbi.nlm.nih.gov/pubmed/20098801
here's one that analyzes the role of melatonin (our sleep hormone that is activated in the dark, not melanin the skin darkening pigment) http://www.ncbi.nlm.nih.gov/pubmed/19957072
here's one that talks about peaks in telogen hairs in the summer, specifically in women with no conditions otherwise affecting hair growth: http://www.ncbi.nlm.nih.gov/pubmed/19407435
here they talk about the ``hair eclipse phenomenon`(ive never heard of that before) http://www.ncbi.nlm.nih.gov/pubmed/18494912

those are some cool ones I found. So I guess it`s believable that hair realy does grow faster in the summer but I`m not sure if I`m 100% convinced yet.

all I did was search pubmed ;p nothing scary.
I do loveeee doing research and learning more though, so that may be why I've made a hobby out of seeking out beauty info.

Great work!!  Fascinating studies too.

http://sbrjournal.net/currentissue/articles/Hair/Hairgrowth.htm

This study was done on just one person, but other sources are cited below the article. Very interesting!

Also meant to say its breaking off like crazy.

You should also avoid brushing it when it's wet because the hair is more likely to snap and break when wet. And definitely don't color or bleach it for a very long time. Let it grow out and get it trimmed every 4-6 weeks until it's healthier, then you can probably wait longer between trims. And I would do deep conditioning treatments (coconut oil) every other night for a few months for about an hour or even over night. I would also let it air dry (no blow dryers!) as much as possible. Having your hair break off is tragic! I feel for you!